how to fetch the custom attribute which has Type Deliverable in BIRT?
One answer
You can check the data dictionary first.
https://www.ibm.com/support/knowledgecenter/SSJJ9R_6.0.4/com.ibm.team.reports.doc/topics/ccm/Custom-Attribute.html
Or try what Rafik suggested in this post (it requires JRS to be installed though).
https://jazz.net/forum/questions/216859/what-custom-rtc-fields-are-available-in-the-data-warehouse